Juhani Otso Berg opted to become a mercenary, believing the pay would be better than that of the Jaeger's – Juhani needed the money to afford cystic fibrosis treatments for his newborn daughter, Elina. This choice cost him his marriage, when his wife, Helmi, disapproving of his new mercenary life, asked for divorce. One night, an Abstergo team headed by Dr. Warren Vidic broke into Berg's home and apprehended him. As Berg watched, Vidic gave Elina Abstergo-brand medication that he promised would help to cure her condition, with the promise of more doses if Juhani would join him. Faced with a solution to his daughter's illness, Berg agreed, with one condition – to eliminate the one who had caused Elina to wake up and cry. Vidic granted it, and Berg ruthlessly killed the Abstergo agent. On 12 October 2012, Berg was briefed alongside several other Abstergo operatives who had impressed Vidic enough to begin training in the second stage of their Animi Training Program. Warren promised Juhani and the other operatives greater power, wealth, and information on the Templars if they succeeded, but also warned that there was no backing out from that point. On 28 October, Berg had interested his superiors within Abstergo with his training in the Animus, enough to be promoted within the ranks of the Templar Order.
